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Four examples...
The Dino starts moving to the right with acceleration pointing to the left… Before starting the motion, it is possible to define the initial position, the initial velocity and the acceleration, dragging the corresponding Vectors. In the graphs drawn, the second graph represents the derivative of the first and the third graph represents the derivative of the second…

Modellus 4
2008

http://modellus.fct.unl.pt

Interactive Modelling with Mathematics
Modellus is designed to introduce students and teachers in scientific computation, namely through the analysis and exploration of mathematical models based on functions, iterations and differential equations. For example, it allows the construction and analysis of models illustrating Newton’s reasoning when comparing the motion of a projectile and the motion of a satellite.

A stroboscopic photo of a collision was placed as a background in the workspace... Three Vectors were created to measure, in an arbitrary scale, the linear momentum of each object, before and after the collision… Dragging the Vectors it is easy to check the conservation of the linear momentum...

The development of Modellus 4 is being done with generous support from the Portuguese Ministry of Education (DGIDC), the Portuguese Foundation for Science and Technology (FCT), the European Community, the Institute of Physics (UK) and the research unit UIED-FCTUNL.

The side of a square was defined… The area and the perimeter were calculated… The square was represented by Geometrical Objects (Segments), which may be linked in succession… Several Pens were created to represent relations between area and perimeter, etc…

The Modellus installation program includes many examples and others are regularly added to the web site http://modellus.fct.unl.pt. Besides the Modellus files, the web site also contains several documents for students and teachers from basic learning levels to higher education. These documents are regularly